Repozytorium
Wyszukaj
Kolekcje
Inne
Structural studies of PdCl2L2 complexes with fluorinated phosphines, phosphines, and phosphinites as precursors of benzyl bromide carbonylation catalysts, and and X-ray crystal structure ofcis-PdCl2[PPh2(OEt)]2.
Autorzy
Rok wydania
2001
Czasopismo
Numer woluminu
79
Strony
752-759
DOI
10.1139/cjc-79-5/6-752
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
PdCl2L2-type complexes with phosphines (L = PPhx(C6F5)3–x(x= 0–3)), phosphites (L = P(OMe)3, P(OPh)3,P(OEt)3), and phosphinites (L = PPh2(OC6F5), PPh2(O-3,5-F2C6H3), PPh2(OEt), PPh2(O-n-Bu), PPh2(O-t-Bu)) were syn-thesized and characterized by UV–vis and31P NMR methods. PdCl2L2complexes with less sterically demandingphosphines (Θ< 140°) exist ascisisomers, which is confirmed by the X-ray structure ofcis-PdCl2[PPh2(OEt)]2. Thesecomplexes react with CO in the presence of NEt3forming Pd(CO)xLy(x+y= 4) type carbonyls characterized by IRspectra. All PdCl2L2complexes studied are active as precursors of benzyl bromide carbonylation catalysts at 40°C and1 atm CO; however, the activity of thecisisomers is higher than that of thetransisomers. The highest yields of thecarbonylation product, phenylacetic acid methyl ester, were obtained usingcis-PdCl2[P(OMe)3]2(92%),cis-PdCl2[P(OPh)3]2(89%), andcis-PdCl2[PPh2(O-n-Bu)]2(78%) as catalyst precursors.
Słowa kluczowe
palladium complexes, fluorinated phosphines, benzyl bromide carbonylation
Adres publiczny
Podobne publikacje
Low-pressure carbonylation of benzyl bromide with palladium complexes modified with PNS (PNS=Ph2PCH2CH2C(O)NHC(CH3)2CH2SO3Li) or P(OPh)3. Structural identification of palladium-catalyst intermediate.
Trzeciak Anna M., Wojtków Wojciech, Ciunik Zbigniew, Ziółkowski Józef J.
Carbonylation of benzyl bromide to benzeneacetatic acid and its esters catalysed by water-soluble palladium complexes.
Trzeciak Anna M., Ziółkowski Józef J.
Structural and mechanistic studies of Pd-catalyzed C–C bond formation: the case of carbonylation and Heck reaction.
Trzeciak Anna M., Ziółkowski Józef J.